(of a person or couple) Having no children, biological, step, or adopted, as a matter of choice.

The use of a child by others for sexual activities in return for remuneration or any other form of consideration.

A person who has no siblings. / A person raised as the sole child in a household.

A child who is raised without human contact as a result of being abandoned, allegedly often raised by wild animals.

(psychology) The childlike aspect of a person's psyche — typically, the personality and the memories of one's childhood — especially in context of coexisting with, and being suppressed by, an adultlike aspect of the person.

(transitive) To impregnate.

(with "years" or "age") Pertaining to the time between puberty and menopause when a woman is able to bear children.

(Christianity) the child Jesus

(euphemistic) A child who is particularly difficult to raise or educate, especially due to a lack of self-control and disruptive and antisocial behavior.

(chiefly Canada, US, idiomatic) One who is a prototypical or quintessential example of something.